September 2011

09/13/2011

I was recently contacted about an issue involving the execution of a Traverse Analysis. The gentleman was experiencing fatal errors while trying to set it up. His surveyor provided him field book notes. Here is the traverse:

BS

OC

FS

ANGLE

DISTANCE

100

241

154

89.3337

298.800

241

154

155

71.1542

230.260

154

155

156

191.3921

94.235

155

156

100

150.1738

348.510

156

100

241

37.1308

590.700

In a traverse, the first setup is defined with known points. Since no coordinates were provided for points 241 and 100, we will create control points using assumed coordinates:

Point Number

Easting

Northing

241

5000

5000

100

5000

5100

Also, notice that point 100 is being referenced on the final setup. Because we established an assumed location for point 100, we will rename the occupied point in the final setup to 242.

Here are the steps for running this traverse:

Create control points for 241 and 100 in the survey database using the above coordinates. Create these before defining the traverse. Civil 3D tends to crash when you try to define a traverse based on control points that do not exist, even though it offers to create them for you.

Create your traverse:

Edit the traverse by entering your foresight point numbers, angles, and distances at the correct setup. Save the contents of the Traverse Editor.

Run the Traverse Analysis. Make necessary changes in the Traverse Analysis dialog box. Do consult with your surveyor for acceptable closure limits and angle error. This particular analysis yielded results that didn't meet the closure limits below.

You will be presented with three reports. Carefully review these before applying the Traverse Analysis to the survey database: